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Noise analysis of a widely used switched capacitor unity gain sampler is presented, which in detail shows that the circuit structure can not only get rid of the offset voltage induced by the OTA involved, but also has the ability of suppressing 1/f noise with operation timing of the sampling capacitor, functioning as correlated double sampling in fact, however paying the price of increasing thermal...
A high order curvature-compensated CMOS bandgap voltage reference(BGR) is presented in TSMC 0.35μm CMOS technology with low power low temperature-coefficient(TC) and high power supply rejection ratio(PSRR). The design is used in low dropout regulators which is applied in implanted chips. TC is compensated by adjusting resistor ratio which have different temperature characteristics. A PSRR enhance...
In this paper, it introduces some new developments of several new LTCC microwave stereo integrated circuits, including: X-band ultra wideband balun, ultra wideband 3dB orthogonal directional couple, a new bandpass filter with highly steep band, ultra-wideband and palanar magtic T, bandpass filter with double transmission zeros, quintuple-mode dual-band filter, ultra broadband vivaldi antenna with...
In this paper, on-wafer de-embedding methods for passive components are evaluated for millimeter wave integrated circuit (MMW IC) design support. An electromagnetic simulation aided de-embedding (EMSAD) technique is proposed. The electromagnetic model is calibrated by matching the open-short de-embedded measurement at relatively lower frequencies. A set of Ground Coplanar Waveguide (GCPW) test structures...
The cryptographic chip is widely used in government, military, finance, business and other fields, so the requirement of security is very high. The globalization of the integrated circuit supply chains has promoted the rapid development of the industry, but the chip is also vulnerable to malicious modified by the attacker, namely hardware Trojan implanted. The paper proposed a hardware Trojan efficient...
Microsystem technology based on micro machining technology and integrated circuit technology has the advantages of miniaturization, integration, intelligence, low cost, high performance, mass production and so on. An overview of the composition and working principle of the microsystem, it introduces the development history of micro system technology, current situation and industrial distribution pattern,...
An optimization design of an Under Voltage Lockout (UVLO) circuit in a bipolar CMOS DMOS (BCD) process is presented in this paper. Compared with the traditional structure, the proposed circuit effectively reduces the hysteresis voltage drift with temperature by introducing the high-order temperature compensation function to the band-gap reference. Thus, the reliability of the UVLO circuit is improved...
In order to work out the accident caused by the impact or frequent current into the ground on person or equipment near the substation when transmission line tower is short-circuited, the technology of multi-point monitoring to scattered current in the ground were studied in this paper. And then the method is verified by simulation and experiment. At the same time, the scattered current of not monitored...
This paper presents the design, trade-off of a very high bandwidth variable gain stage, and the practical limits during its implementation as a tunable gain cell in the high speed equalizer for next generation serial electrical / optical communication links. The variable gain stage presented in this work, achieves a bandwidth of above 50 GHz and a tunable gain range of 40 dB. With a very high input...
A low quiescent current low-dropout regulator (LDO) applied in energy harvest system is presented in this paper. With super-source follower, the LDO has only one pole within loop unity gain bandwidth. And current buffer compensation is utilized to maintain the phase margin under the full range of load current. In order to decrease the power dissipation on the resistors of voltage divider, the resistors...
Due to process variations at the very low technology nodes, the manufactured chips are grouped into different speed bins. Currently, various types of maximum operation frequency (Fmax) tests are performed for efficient speed binning by applying complex functional or structural test patterns, which incurs high test cost. In this paper, a novel on-chip Binning Sensor is proposed which can monitor the...
An active quasi-circulator (AQC) operating at a frequency band ranging from 1.2–3.8 GHz is designed in a 0.18-μm CMOS process. To improve the isolation between AQC's ports common-gate (CG), common-source (CS) and common-drain (CD) configurations have been employed. To particularly improve the transmitter-to-receiver port isolation, out-of-phase cancellation is employed by making the transmit signal...
In this paper studies an X-band ultra-wideband micro-balun based on LTCC, the working frequency of 7–13GHz, belonging to the X-band, the relative bandwidth is 60%. In this paper, from the design and manufacture of the product, combined with the theoretical basis, through the HFSS simulation software to complete the design, finally, it decided to use three coupling lines to improved Marchand Balun...
Antenna is one of the key front-end components of wireless communication system and the radar system. A K-band slotted ridge waveguide antenna arrays based on radar-communication integration, consist of a transmitting antenna and a receiving antenna, is designed and measured. The relationship between the slot admittance, offset distance and resonant length of slot is analyzed. Combined with the slot...
Objective: The stepped-frequency chirp signal is a wide band radar signal which can obtain high resolution range profiles. But when it come across phase discordance, the energy of target cannot be accumulated and the corresponding radar system cannot detect any targets. In order to resolve the effect of phase uncertainties, an novel phase error compensation method is proposed in this paper. Method:...
We present a novel SIMD multiply array for fixed-point and floating-point multiplication. To be concrete, the array supports one 54 (unsigned), one 32 or four 16 bits (signed/unsigned) operation. Based on the enhanced booth decode algorithm, the time overhead of the multiplications is reduced. The proposed intermediate result reuse strategy can reduce area overhead of the SIMD multiply array. The...
MIMO-OFDM technology is the key technology for the IEEE802.11ac broadband wireless LAN standards. The physical layer implementation schemes of the IEEE802.11ac uplink multi-user systems was investigated. The simulation results of the performance for uplink multi-user MIMO-OFDM systems are given.
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